<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <h3>@keyup.etner -> 监听键盘回车事件 </h3>
        <input type="text" v-model="username" @keyup.enter="fn">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>
    <script>
        const app = new Vue(
            {
                el: "#app",
                data: {
                    username: ''
                },
                methods: {
                    fn() {
                        console.log(this.username);
                    }
                }
            }
        )
    </script>
</body>

</html>